@article{ref1,
title="Changes in the physical state of students in the period of the work semester",
journal="Gigiena i Sanitariia",
year="1980",
author="Sautkin, M. F. and Chernov, S. N.",
volume="",
number="2",
pages="45-46",
abstract="<p>[Abstract unavailable]</p><p>Language: ru</p>",
language="ru",
issn="0016-9900",
doi="",
url="http://dx.doi.org/"
}